Add and Remove Class in JavaScript: A CodePen Guide
This article will guide you through the basics of adding and removing classes in JavaScript using CodePen. We'll cover the essential methods and provide examples for your understanding.
Why Use Classes?
Classes in CSS are fundamental for styling your web pages. They allow you to group styles together and apply them to specific elements easily. JavaScript empowers us to dynamically manipulate these classes, creating interactive and engaging user experiences.
Adding a Class with JavaScript
Here's how you can add a class to an element using JavaScript:
1. Select the element:
Use JavaScript's document.querySelector() or document.getElementById() to target the specific element you want to modify.
2. Add the class:
The classList.add() method efficiently adds a new class to the element.
CodePen Example:
Add Class Example
In this example, clicking the button will add the active class, changing the button's text color to red.
Removing a Class with JavaScript
To remove a class from an element, we use the classList.remove() method:
CodePen Example:
Remove Class Example
Hidden Content
Here, the myDiv element is initially hidden because of the hidden class. Clicking the "Show" button removes the hidden class, revealing the content.
Toggle a Class
The classList.toggle() method provides a convenient way to add or remove a class based on its presence. If the class exists, it's removed; if it doesn't, it's added.
CodePen Example:
Toggle Class Example
Click to toggle
In this example, clicking the myDiv element toggles the active class, changing its background color.
Conclusion
Adding, removing, and toggling classes with JavaScript gives you the power to create dynamic and interactive web pages. Mastering these fundamental techniques will allow you to build more engaging and user-friendly web applications.